FBM24B / FBM25B

General Information

Manufacturer: Foxboro (Schneider Electric)

Model: FBM24B / FBM25B

Series: I/A Series EcoStruxure DCS Compact 200 Series

Type: 16‑Channel Isolated Discrete Input Module (Expansion Input Module)

Function: Reads discrete contact/voltage signals from field devices (switches, relays, sensors)

Environmental Rating: Class G3 harsh industrial environment (ISA S71.04)

Certification: CE, ATEX, CSA; Class 1 Division 2 / Zone 2 hazardous area approved

Protection Class: IP20

Weight: Approx. 600 g

Dimensions (mm): 140 (H) × 165 (W) × 45 (D)

Key Specifications

Channel Quantity: 16 galvanically isolated discrete input channels

Isolation: Per‑channel galvanic isolation (channel‑to‑channel, channel‑to‑ground)

Input Voltage Ranges (External Excitation):

24 VDC (FBM24B: contact sense)

48 VDC / 125 VDC (FBM25B: voltage sense)

120 VAC / 240 VAC (via termination assemblies)

Input Current: 2–10 mA (per channel, depending on voltage)

Input Filter: Software‑configurable (debounce time)

Module Power: 24 VDC (+5% / −10%)

Power Consumption: ≤ 3 W

Operating Temperature: 0°C to +60°C

Storage Temperature: −40°C to +85°C

Humidity: 5%–95%, non‑condensing

Withstand Voltage: 600 VAC for 1 minute (channel‑to‑ground/channel‑to‑channel)

Main Features

16 Fully Isolated Input Channels: Prevents crosstalk and fault propagation.

Multi‑Voltage Compatibility: Supports 24/48/125 VDC and 120/240 VAC inputs via TAs.

Contact Sense & Voltage Sense: FBM24B for dry contacts; FBM25B for voltage‑based inputs.

Configurable Debounce Filter: Eliminates false triggers from contact bounce.

Hot Swappable: Online replacement without system shutdown.

Redundancy Support: 1:1 redundant pairing for high availability.

LED Diagnostics: Front‑panel LEDs for module status and per‑channel indication.

Fault‑Tolerant Operation: Works with FCP280 for patented fault‑tolerant control.

Applications

Process Industries: Chemical, power, oil & gas, water treatment.

Discrete Input Monitoring: Valve position switches, limit switches, relay contacts, alarm inputs.

Hazardous & Harsh Environments: Class G3, Class 1 Div 2/Zone 2 areas.

High‑Reliability Systems: Requires redundancy, hot‑swap, and advanced diagnostics.